14k Yellow or White Gold Cubic Zirconia Tiny Cross Stud Earrings with Child Safe Screwbacks These earrings are made of solid 14k gold, featuring high quality cubic zirconia stones. Our cubic zirconia is bright and clear with an unmatched sparkle, so it will easily convince others it's the real thing. Earrings measure 6mm (0.24 in) x 4mm (0.16 in). Please note that the post measures 8mm, which is shorter than a standard post.